On Sun, 24 Mar 2019 17:48:54 +0000, Bob Minchin wrote:

On 24/03/2019 12:32, T i m wrote:
Hi all,

My old 8x4 shed / mini workshop (18th birthday present) is still in
Mums back garden and a few years back a mate (with me helping)
replaced the (flat / sloping, whatever that's called) stock roof with
a larger (greater overlap on the front / door end) OSB panels.

We felted it from bottom to top, felt nails ever few inches on the
overlaps and round the edges and the sides had fascias screwed over
them.

Mum phoned during the recent storm to say that most of the top strip
had come off and in following winds, as did the rest of that strip
later on.

Now, there was no adhesive visible and I can't remember it being used
so what might have allowed it to pull off so cleanly / completely?

All the nails are still there (felt ripped round), as are the fascias
that are trapping the top strip on 3 sides so it really has been
ripped off?

I was wondering if it was being flexed (sucked) up and down in the
middle of the strip it might have worked hardened the edges where it
goes over the edges and behind the fascias and that's where it
initially let go?

So, when we get a mo (and on a warm dry windless day) I intend to
remove the fascias (screwed on), all the nails on the overlap and re
felt and nail the top strip, but should I also glue it on?

Cheers, T i m

Felt is a waste of time and effort. Use EPDM and do it once only

The only felt that I've found to be strong was one with glass fibre in it.
The ordinary felt could be torn with thumb and 2 fingers of one hand; the
g-f felt I couldn't tear. Got it from a proper roofers place near Doncaster.
--
Peter.
The gods will stay away
whilst religions hold sway